Manufacturers along the river processed these materials and shipped the final product the same way.

That hard edge is no longer needed for moving freight in certain parts of the Detroit River. But its legacy isn’t so great for river species looking for a place to live, the costs to repair its crumbling or cracking rim and for the eyes of Detroiters.

Constructing a section of Michigan’s first urban state park was plagued by “concrete dinosaurs,” when the project began in 2008, said Luba Sitar, southeastern Michigan Department of Natural Resources recreation division manager.

One park area was transformed from a brownfield into a stormwater-treating wetland. The staff removed relics of an industrial past—boat launches, wood structures, train tracks and the turnstile upon which train cars turned after dropping their loads, Sitar said. The staff also found historic storm water connections and drains.

Softening the way we think about shorelines

Here’s how soft shoreline engineering works: In place of concrete and steel, designers put vegetation, stone and other materials that soften the edge while maintaining a stable shoreline.

The technique requires use of ecological principles to reduce erosion, keep the shoreline intact, restore habitat, improve public access and make the shoreline look attractive.

In 1999, the Detroit American Heritage River Initiative held a binational conference. Attendees created a manual of best practices that drove testing and demonstrations of the technique in the Detroit River area. Thirty-eight projects costing more than $16.5 million was the result.

Each project was approved by the Michigan Department of Natural Resources and Environment and the U.S. Army Corps of Engineers.

Creating a “waterfront porch”

Acting as commerce and industry’s backdoor, 31 of 32 miles of the Detroit River shoreline were transformed with concrete and steel, according to a report by John Hartig, U.S. Fish and Wildlife Service refuge manager of the Detroit River International Wildlife Refuge, and Anna Cook, a service biological technician.

“We were able to reduce that hardened and sheeted edge and create more natural habitat,” Doher said of JJR LLC’s work. That’s because freighters don’t unload in the East District anymore.

“You’ve got to be sort of opportunistic,” Hartig said. “You’ve got to be at the table at the right time for this.”

That right time is when Hartig and his team get to the table early.

“That’s where you get your big win,” Hartig said.

Soft shoreline engineering creates habitat for wildlife and a visually appealing “waterfront porch” for businesses, industry, homeowners and public places.

Hartig and Cook wrote that the technique can increase waterfront property values while reclaiming urban waterfront shorelines.

The hard industrial shoreline in the East District was replaced with natural stone and plants, creating habitat for fish and wildlife native to the Detroit River, Doher said. The soft shoreline also cleans stormwater before it flows into the river.

Native plant roots stabilize the shoreline in a stormwater-treating wetland built in Milliken State Park. Photo: Courtesy of Luba Sitar, Michigan DNRE.

The process is complicated. An orange snow fence served to indicate where old and new soil met, Sitar said. The team brought in clay and created islands on the 5-acre site. Islands were lined with burlap-wrapped logs and wetland plants were placed on top of them.

The roots will eventually stabilize the shoreline as the logs disintegrate, Sitar said. Storm water now enters the wetland area from 11 acres of land in and near the park before spilling into the Detroit River.

Construction was completed in October 2009. Sitar hopes local charter and public school science classes will monitor progress by taking water samples at the top of the wetland and at the discharge site.

Soft engineering is soft on funds

At its best, the technique is half the cost of hard shoreline techniques. Concrete or steel sheet piling costs about $2,000 per linear foot, Hartig said. Soft techniques could cost as little as $1,000 per linear foot. All depends on the project’s specific needs and materials, however.

While hard design structures often have a limited life, soft engineering produces living shorelines that can repair themselves.

The technique can’t be used everywhere, but where it is appropriate, the option is a less costly one with multiple benefits, Hartig said.

“It’s an initiative or practice whose time has come.”

Editors note: This is the first in an occasional series of stories looking at soft shoreline engineering.

6 thoughts on “Re-engineering history: Softening the way we think about shorelines”

Shoreline issues are a great topic here in Hawaii where I live on the Big Island. Erosion, access rights, tsunamis, even lava flows that cut through residential subdivisions before adding to the coastline all compromise native species that live close to the coastline. Again, mitigation for these areas is very local-dependent: are the nearby people concerned about turtle hatching, or whatever the current issue is, and are they doing anything about it? Usually, the conflict is between environment-oriented folks vs profit-oriented folks (resort developers, etc.). Nothing new there!
Aloha,
Chris

We just moved back to Michigan two years ago from North Idaho when we moved to Idaho we discovered a love foe environment that Michigan had long lost. Now We have returned to a place that is finally getting an idea of how it should be again and it is great to see that happening.

It is about time we start to put back for the years that have been taken away in beauty and functionality. Now let’s get back to fishing and enjoying life as it was.

Way to go, a page write out of Ice Boom Theory. Here in W.N.Y. we have what could be a stretch of the ugliest river on earth. The sickly Niagara. That is because the New York Power Authority is stopping the annual rejuvenation process of the Lake Erie Ice flow into Lake Ontario. Part of the physical action of the ice movement is what put replenishment sand and gravel all along our banks. Since it has been stopped, we too have to line our once mighty river with construction debris. It’s a sad day for the Tonawandas and Grand Island. Anyhow, I’d like you to visit my site at http://www.bantheboom.com and read more of what happens to this giant and inter-connected water way to help the N.Y.P.A. maximize profits. I am just a small town amateur scientist/fisherman that set out to solve some vexing problems our Lower Great Lakes were facing. What I found was that the science was the easy part. It is over coming greed and apathy that is hard. See if you can help. thanks, Joe Barrett

I’ve lived here in Detroit for over 20 years, and I must say before the transformation to a soft shoreline many parts of the riverfront we’re unusable to Johb Q. Public. But now, it’s been a great & welcomed change. It looks beautiful, & I love to take a stroll down there when the weather is right, & time permits for me. Utilizing our natural resources is awesome!

We used to live in Cincinnati and Baltimore, and now in Cleveland. Both of the prior communities utilized their water shores much better than Cleveland. It’s a real shame, but old money can’t agree in Cleveland, so nothing gets accomplished.